Swtch traceback to --native in cugraph

[galipremsagar]

In cudf we have observed a ~10% speed up of pytest suite execution by switching pytest traceback to --native:

currently:

102474 passed, 2117 skipped, 902 xfailed in 892.16s (0:14:52)

--tb=short:

102474 passed, 2117 skipped, 902 xfailed in 898.99s (0:14:58)

--tb=no:

102474 passed, 2117 skipped, 902 xfailed in 815.98s (0:13:35)

--tb=native:

102474 passed, 2117 skipped, 902 xfailed in 820.92s (0:13:40)

This PR makes similar change to cugraph repo.

xref: rapidsai/cudf#16851

[BradReesWork]

/merge